自然キラー細胞は,抗ウイルスT細胞を調節するレオスタットとして作用します
Stephen N Waggoner1, Markus Cornberg, Liisa K Selin
1Department of Pathology and Program in Immunology and Virology, University of Massachusetts Medical School, Worcester, Massachusetts 01655, USA.
Nature
|November 22, 2011
まとめ
ナチュラルキラー (NK) 細胞は,ウイルス感染症におけるT細胞の反応を調節する. LCMVのマウスモデルでは,NK細胞はT細胞の枯渇と病態を制御し,ウイルス持続性と疾患の重症度を管理するためにレオスタットとして作用します.
科学分野:
- 免疫学 免疫学とは
- ウイルス学 ウイルス学 ウイルス学
- 感染症 感染症は感染症です.
背景:
- 抗ウイルスT細胞は,C型肝炎ウイルス (HCV) とヒト免疫不全ウイルス (HIV) の感染の結果に影響を与えます.
- ナチュラルキラー (NK) 細胞は,HIVとHCVの進行に関与しており,直接のウイルス解離を超えた役割を果たしていることを示唆しています.
- NK細胞は免疫調節機能を持ち,T細胞の反応に間接的に影響を与える可能性があります.
研究 の 目的:
- T細胞依存のウイルス持続性と免疫病理学におけるNK細胞の役割を調査する.
- ウイルス感染症の文脈でNK細胞がT細胞の反応を調節するメカニズムを解明する.
- NK細胞がCD8T細胞の機能と疲労に与える影響を調べる.
主な方法:
- HIVおよびHCV感染症の確立されたモデルであるリンパ球性膜炎ウイルス (LCMV) のマウスモデルを使用しました.
- ウイルス感染中にNK細胞,CD4T細胞,CD8T細胞の相互作用を分析した.
- 異なるウイルス用量のNK細胞活動と疾患のアウトカムへの影響を評価した.
主要な成果:
- 活性化されたNK細胞が活性化されたCD4T細胞を排除し,CD8T細胞の機能と疲労に影響を与える三方向の相互作用が実証されました.
- ウイルスの高用量では,NK細胞はT細胞の枯渇とウイルスの持続を可能にすることで,致命的な病理を防ぐことが観察されました.
- 中程度のウイルス用量では,NK細胞が逆説的に,致命的なT細胞媒介病理を容易にしたことが判明した.
結論:
- NK細胞はレオスタットとして機能し,抗ウイルス性CD8T細胞に対するCD4T細胞のサポートを調節する.
- NK細胞の活動は,T細胞の反応を制御することによって,ウイルスの病原性と持続性を決定的に調節する.
- NK細胞のダイナミクスを理解することは,ウイルス感染症と関連する免疫病理学の管理に不可欠です.
関連する概念動画
Immune Response Against Viral Pathogens
The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
NK Cells
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Cytotoxic T Cells-mediated Immune Response
Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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Cells of the Innate Immune Response
The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
T Cell Types and Functions
When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Immune Surveillance by NK Cells and Phagocytes
Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
Natural Killer Cells: The Fast Responders
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Cell-mediated Immune Responses
Overview

